Expose InlineTextBoxes in the accessibility tree.

public/web/WebAXEnums.h

Index: public/web/WebAXEnums.h
diff --git a/public/web/WebAXEnums.h b/public/web/WebAXEnums.h
index fbe08067f938e089c3f46e643b825458e74bc145..a381bec11d5abd65b1b03342185b069d18cf3132 100644
--- a/public/web/WebAXEnums.h
+++ b/public/web/WebAXEnums.h
@@ -111,6 +111,7 @@ enum WebAXRole {
     WebAXRoleImageMap,
     WebAXRoleImage,
     WebAXRoleIncrementor,
+    WebAXRoleInlineTextBox,
     WebAXRoleLabel,
     WebAXRoleLegend,
     WebAXRoleLink,
@@ -208,6 +209,14 @@ enum WebAXState {
     WebAXStateVisited,
 };
 
+// Text direction, only used for role=WebAXRoleInlineTextBox.
+enum WebAXTextDirection {
+    WebAXTextDirectionLR,
+    WebAXTextDirectionRL,
+    WebAXTextDirectionTB,
+    WebAXTextDirectionBT
+};
+
 } // namespace WebKit
 
 #endif